<template>
    <div>
      <!--面包屑导航各区域-->
      <el-breadcrumb separator="/">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>参数列表</el-breadcrumb-item>
      </el-breadcrumb>
      <!--卡片视图区域-->
      <el-card>
        <!--头部警告区域-->
        <el-alert show-icon title="注意：注意只允许为第三级分类设置相关参数" type="warning" :closeble="false">
        </el-alert>
        <!--选择商品分类的区域-->
        <el-row class="cat_opt">
          <el-col>
            <span>选择商品分类：</span>
            <!--选择商品分类的级联选择框-->
            <el-cascader v-model="selectedCateKeys" :options="cateList" :props="cateProps"
              @change="handleChange"></el-cascader>
          </el-col>
        </el-row>
        <!--Tab页签-->
        <el-tabs v-model="activeName" @tab-click="handleTabClick">
          <!--添加动态参数的面板-->
          <el-tab-pane label="动态参数" name="many">
            <!--添加参数的按钮-->
            <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加动态参数</el-button>
            <!--动态表格参数-->
            <el-table :data="manyTableDate" border stripe>
              <!--展开行-->
              <el-table-column type="expand">
                <template slot-scope="scope">
                  <!--循环渲染 Tag 标签-->
                  <el-tag v-for="(item,index) in scope.row.attr_vals" :key="index" closable @close="handleClose(scope.row,index)">{{item}}</el-tag>
                  <!--输入文本-->
                  <el-input v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small"
                    @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)" class="input-new-tag">
                  </el-input>
                  <!--添加按钮-->
                  <el-button v-else size="small" @click="showInput(scope.row)">+ 添加</el-button>
                </template>
              </el-table-column>
              <!--索引列-->
              <el-table-column type="index">#</el-table-column>
              <el-table-column label="参数名称" prop="attr_name"></el-table-column>
              <el-table-column label="操作">
                <template slot-scope="scope">
                  <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                  <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                </template>
              </el-table-column>
            </el-table>
          </el-tab-pane>
          <!--添加静态属性的面板-->
          <el-tab-pane label="静态属性" name="only">
            <!--添加属性的按钮-->
            <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加静态属性</el-button>
            <!--静态表格参数-->
            <el-table :data="onlyTableDate" border stripe>
              <!--展开行-->
              <!--展开行-->
              <el-table-column type="expand">
                <template slot-scope="scope">
                  <!--循环渲染 Tag 标签-->
                  <el-tag v-for="(item,index) in scope.row.attr_vals" :key="index" closable @close="handleClose(scope.row,index)">{{item}}</el-tag>
                  <!--输入文本-->
                  <el-input v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small"
                            @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)" class="input-new-tag">
                  </el-input>
                  <!--添加按钮-->
                  <el-button v-else size="small" @click="showInput(scope.row)">+ 添加</el-button>
                </template>
              </el-table-column>
              <!--索引列-->
              <el-table-column type="index"></el-table-column>
              <el-table-column label="属性名称" prop="attr_name"></el-table-column>
              <el-table-column label="操作">
                <template slot-scope="scope">
                  <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                  <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                </template>
              </el-table-column>
            </el-table>
          </el-tab-pane>
        </el-tabs>
      </el-card>

      <!--添加参数的对话框-->
      <el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
        <!--添加参数的表单-->
        <el-form :model="addForm" :rules="addFromRules" ref="addFormRef" label-width="100px">
          <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="addForm.attr_name"></el-input>
          </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
    <el-button @click="addDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addParams">确 定</el-button>
  </span>
      </el-dialog>

      <!--修改参数的对话框-->
      <el-dialog :title="'修改' + titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
        <!--修改参数的表单-->
        <el-form :model="editForm" :rules="editFromRules" ref="editFormRef" label-width="100px">
          <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="editForm.attr_name"></el-input>
          </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
    <el-button @click="editDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="editParams">确 定</el-button>
  </span>
      </el-dialog>
    </div>

</template>

<script>
export default {
  name: 'params',
  data() {
    return {
      // 商品分类列表
      cateList: [],
      // 级联选择框的配置对象
      cateProps: {
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        childrem: 'children'
      },
      // 级联选择器双向绑定的数组
      selectedCateKeys: [],
    //  被激活的页签名称Tab
      activeName: 'many',
      // 动态参数数据
      manyTableDate: [],
      // 静态参数数据
      onlyTableDate: [],
      // 控制对话框的显示与隐藏
      addDialogVisible: false,
      // 添加参数的表单数据对象
      addForm: {
        attr_name: ''
      },
      // 添加表单的验证规则对象
      addFromRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      },
      //  控制修改对话框的显示修改
      editDialogVisible: false,
      //  修改的表单数据对象
      editForm: {
        attr_name: ''
      },
      // 修改表单的验证规则对象
      editFromRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      }
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    // 获取所有的商品列表
    async getCateList() {
      const {data: res} = await this.$http.get('categories')
      if (res.meta.status !== 200) return this.$message.error('获取列表数据失败！')
      this.cateList = res.data
    },
    // 级联选择框选择变化改变的函数
    handleChange() {
        this.getParamsData()
    },
    // Tab页签点击事件函数
    handleTabClick() {
      this.getParamsData()
    },
    // 获取参数列表的函数
    async getParamsData() {
      // 证明选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableDate = []
        this.onlyTableDate = []
        return
      }
      //    根据所选分类Id，和当前所处的面板，获取对应的参数
      const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`, {params: {sel: this.activeName}})
      if (res.meta.status !== 200) return this.$message.error('获取列表参数失败！')
      res.data.forEach(item => {
        // 检测空值的存在，不存在进行赋值操作
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        item.inputVisible = false
        // 文本框输入的值
        item.inputValue = ''
      })
      if (this.activeName === 'many') {
        this.manyTableDate = res.data
      } else {
        this.onlyTableDate = res.data
      }
    },
    // 监听对话框的关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },
    // 点击按钮,添加参数
    addParams() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return;
        const {data: res} = await this.$http.post(`categories/${this.cateId}/attributes`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 201) return this.$message.error('添加参数失败！');
        this.$message.success('添加参数成功！');
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    //  点击按钮，展示修改的对话框
    async showEditDialog(attr_id) {
      const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`, {
        params: {attr_sel: this.activeName}
      })
      if (res.meta.status !== 200) return this.$message.error('获取参数信息失败！')
      this.editForm = res.data
      this.editDialogVisible = true
    },
    // 监听修改表单的函数
    editDialogClosed() {
    // 重置修改表单的参数
      this.$refs.editFormRef.resetFields()
    },
    // 点击按钮修改参数信息
    editParams() {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return;
        const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
        attr_name: this.editForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 200) return this.$message.error('修改参数失败！')
        this.$message.success('修改成功！')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
  //  根据id删除对应的参数项
    async removeParams(attr_id) {
     const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      if (confirmResult !== 'confirm') return this.$message.info('已取消删除')
      const {data: res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
      if (res.meta.status !== 200) return this.$message.error('删除失败！')
      this.$message.success('删除成功')
      this.getParamsData()
    },
    // input失焦过回车触发该事件
    handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
      }
      // 如果没有return 则证明输入的内容，需要做后续处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      // 发起请求保存操作
      this.saveAttrVals(row)
    },
    // 将attr_vals的操作保存到数据库
    async saveAttrVals(row) {
      // 解决按enter 添加空串的判断
      row.attr_vals.map(item => item === '' ? row.attr_vals.splice(row.attr_vals.length - 1, 1) : row.attr_vals);
      const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: (row.attr_vals).join(' ')
        });
      if (res.meta.status !== 200) return this.$message.error('修改参数项失败')
    },
  //  点击按钮，显示文本框
    showInput(row) {
      row.inputVisible = true
      // $nextTick方法作用，当页面上元素被重新渲染后，才会指定回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus();
      });
    },
  //  删除对应的tag标签内容
    handleClose(row, i) {
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)
    }
  },
  computed: {
    // 如果按钮需要被禁用，返回true,否则返回false
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) {
        return true;
      }
      return false;
    },
    // 当前选中三级分类的Id
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    titleText() {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  }
}
</script>

<style lang="less" scoped>
.cat_opt{
  margin: 15px 0;
}
.el-tag{
  margin: 10px;
}
.input-new-tag{
    width: 150px;
  }
</style>
